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b=6cm
sin45=h/b
√2/2=h/6cm
2h=6√2 cm /:2
h= 3√2 cm
P= ah
P=10 cm * 3√2 cm
P=30√2 cm2
h√2= 10 |:√2
h= 10√2/2
h= 5√2
P= a*h
P = 6*5√2
P = 30√2 cm²
z 10√18 trzeba wyciagnac pierwiastek czyli 10√18=10√9*2=30√2